/Engine/Source/Runtime/Core/Public/GenericPlatform/GenericPlatformProcess.h
Executes a process, returning the return code, stdout, and stderr. This call blocks until the process has returned.
static bool ExecProcess ( const TCHAR * URL, const TCHAR * Params, int32 * OutReturnCode, [FString](API\Runtime\Core\Containers\FString) * OutStdOut, [FString](API\Runtime\Core\Containers\FString) * OutStdErr, const TCHAR * OptionalWorkingDirectory, bool bShouldEndWithParentProcess )